improved inclusion-exclusion identities via closure operators

improved inclusion-exclusion identities via closure operators

;Klaus Dohmen
Proteins 2000 Vol. 4 pp. -
64
dohmen2000discreteimproved

Abstract

Let (A v) v ∈ V be a finite family of sets. We establish an improved inclusion-exclusion identity for each closure operator on the power set of V having the unique base property. The result generalizes three improvements of the inclusion-exclusion principle as well as Whitney's broken circuit theorem on the chromatic polynomial of a graph.

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